AK4367 Datasheet, PDF (23/38 Pages) Asahi Kasei Microsystems – OUTPUT MIXER & HP - AMP 24 BIT 2 CH DAC

ASAHI KASEI
[AK4367]
3) LIN/RIN/MIN → HP-amp, MOUT
Power Supply
PDN pin
PMVCM bit
(1) >150ns
(2) >0
LINL, MINL,RINR, MINR
LINM, RINM, MINM bit
(3) >0
PMHPL/R bit
(5) >2ms
MUTEN bit
PMMO bit
Don’t care
(5) >0
LIN/RIN/MIN pin
HPL/R pin
(Hi-Z)
(4)
(6)
(Hi-Z)
(7)
(6)
MMUTE,
ATTM3-0 bit
10H(MUTE)
0FH(0dB)
MOUT pin
(Hi-Z)
(8)
(8)
(8)
(Hi-Z)
Figure 19. Power-up/down sequence of LIN/RIN/MIN, HP-amp and MOUT
(1) PDN pin should be set to “H” at least 150ns after the power is supplied. MCLK, BICK and LRCK can be stopped
when DAC is not used.
(2) PMVCM bit should be changed to “1” after PDN pin goes to “H”.
(3) LINL, MINL, RINR, MINR, LINM, RINM and MINM bits should be changed to “1” after PMVCM bit is changed to
“1”.
(4) When LINL, MINL, RINR, MINR, LINM, RINM or MINM bit is changed to “1”, LIN, RIN or MIN pin is biased to
0.45 x VDD voltage.
(5) PMHPL, PMHPR, MUTEN and PMMO bits should be changed to “1” at least 2ms (in case external capacitance at
VCOM pin is 2.2µF) after LINL, MINL, RINR, MINR, LINM, RINM and MINM bits are changed to “1”.
(6) Rise time of headphone amp is determined by external capacitor (C) of MUTET pin. The rise time up to VCOM/2 is
t_r = 100k x C(typ). When C=1µF, time constant is 100ms(typ).
(7) Fall time of headphone amp is determined by external capacitor (C) of MUTET pin. The fall time down to 0V is t_f =
200k x C(typ). When C=1µF, time constant is 200ms(typ).
PMHPL, PMHPR, LINL, MINL, RINR, MINR, LINM, RINM and MINM bits should be changed to “0” after HPL
and HPR pins go to VSS.
(8) When PMMO bit is changed, pop noise is output from MOUT pin.
MS0247-E-01
- 23 -
2004/11